Heat oven to 350°F. Place pie crust in 9-inch glass pie pan as directed on box for One-Crust Filled Pie. Place asparagus and mushrooms in crust.
In large bowl, toss cheese with flour. Stir in eggs, half-and-half, salt, pepper and nutmeg. Pour over asparagus and mushrooms.
Bake 55 to 60 minutes or until knife inserted in center comes out clean. Let stand 5 minutes before serving.